Machine for handling molding sand



May 12, 193 1.

E. O. BEARDSLEY MACHINE FOR HANDLING MOLDING SAND File Oct. 8, 1928 2Sheets-Sheet l May 12, 1931. E. o. BEARDSLEY 1,304,394

MACHINE FOR HANDLING HDLDING SAND Filed Oct. 8. 1928 2 Sheets-Sheet 2 tmm- ImimmI I mulllllllll ive/2Z5)" Patented May 12, 1931 ELMER 0. IBEARDSLEY, OF CHICAGO, ILLINOIS,JASSIGNOR TO THE BEA RDSLEY 86 PIPECOMPANY, OF CHICAGO, ILLINOIS, CORPORATION OE ILLINOIS MACHINE FORHANDLING- ivronnrne SAND Application filed October 8, 1928. Serial No.311,115.

The invention relates to apparatus for handling sand delivered tomolding machines. In foundries, it frequently occurs that scrap orpieces of metal become mixed with the sand that is removed from moulds,which must be separated from the sand before l t/1S delivered to amolding machine of the projector type,

- to prevent injury to the machine.

The primary ob ect of the invention is to provide improved apparatus forhandling the sand in'which a magnetic separator is disposed to act-uponthe sand as it is discharged.

by an elevator in sufficient quantity tokeep the projector supplied, intransit to the proector.

mittently operated so that the magnetic scrap or parts to be separatedfromthe sand will be intermittently moved out of the magnetic zone andseparately discharged from the sand during these intermittent movements.

This results in a more effective separation of the scrap from the sand,particularly when'a lar e volume of sand is oassed over the drum..

Other objects of the invention will appear from the detaileddescriptlon.

The invention consists in the several novel features hereinafter setforth and more particularly'deiined by claims at the conclusion hereof.

In the drawings: Fig. 1 is a side elevation of a portion of a moldingmachine, having the invention embodied therein. Fig. 2 is a horizontalsection on line 2--2 of Fig. 1. Fig. 3 is a vertical longitudinalsection. Fig. lis a vertical section through the sepa-,

rator drum.

The mventlon 1s exemplified in connection with a channelled supportingcolumn or standard '7 which may be mounted on a portable molding machineof the tractor type set forth in Patent No. 1,408,796. The molding,

sand is elevated from a pile onth-e floor by an elevator comprlsmg achain 8, the llnks of which have secured theretobuckets 9.

This chain is usually driven by a sprocket. at the lower end of themachine, as exempliof approximately 180,

lied in the aforesaid patent, and its upper end is guided by a pulley 10mounted on a shaft 11 which is suitably supported from the column 7 Thedownwardly travelling reach ofothe chain and buckets travel in thechannel of the column 7. At the upper end of the column, there is formeda discharge hoodor chute 12. The material from the buckets is dischargeddownwardly onto a deflector plate .13 in the hood. The drum 14c of amagnetic separator is mounted so one side-thereof will be disposed belowplate 13, and-the sand discharged from the buckets will be deliveredonto the other side of the drum which rotates downwardly to dischargethe The drum sand into a conveyor chute l5. comprlses a peripheral wall1 11 and sides 14 whichare rotatably mounted on a stationary shaft '16.The side walls of hood 12 are extended downwardly at the sides of thedrum to confinethe sand to the drum, and the outer wall 12 of the hoodis spacedfrom the discharge side ofthe drum to permit the sand to bedischarged downwardly over-the drum. A baffle 17 is spaced fromone sideof the drum to deflect the sand toward the discharge sideof the drum.Shaft 16 is supported by brackets 22' which are securedby bolts -23tocolumn 7. Said shaft is secured against rotation by CQPSQA: which areadapted to clamp, by means of bolts 26, the ends-of the shaft, in theangular recesses 25 in the ends of said bracket. A stationary magnet 19,comprising a core and suitable windings, isfiizedly secured to shaft 16inside of the drum. Conductors 20 lead to and'from said windings,andextend through a hole in said shaft. This magnet is adapted toattract and hold on the drum, magnetic material, such as cast iron scrapmetal parts. which,

in practice, frequentl 1 become mixed with, or left in, the molding sandwhen it is cleaned out of flasks. The magnet is shaped to be effectiveupon the scrap throughout an are which includes that portion of the drumwith which the descending sand contacts, and a suflicient distancebeyond the point of discharge of the sand to release the scrap andseparately discharge it into achute 21 secured on the column 7.

be separately discharged from the sand, while.

at the same time, operating the drum so that its periphery will notaccclerate'the, movement of the sand and scrap suinciently'to render themagnet ineilicient in separting the scrap from the sand. For thispurpose, mechanism is provided to rotate-thedrum intermittently orstep-by-step. This mecha nism comprises a shaftQS mounted in'bearings 29which are secured bybolts 29 in brackets 22, a sprocket wheel 30, keyedto drive shaftQS, a d having its teeth engaged by the upwardlyanddownwardlyreaches of chain 8, to continuously-r te said-shaft, aneccentricor v 'ist pin 31 or. one end of shaft 28, a pawl pivotedratchet-wheel 33, which of one of the drum-sides 14: and'is engaged andintermittently advanced by the free end 34 of said pawl, which rideson'the wheel. The wrist-pin alteri'iately op'erates the pawl to engage atooth "on the ratchet-wheel and rotateor advance the drum one step, andto idly retract the pawl. During the retraction of the pawl, the'drumremains stationary. This mechanism moves the periphery of the drum,during the operativestrokes of pawl 32, so the attracted scrap will passout of molding sand in large quantities, as'is neces sa'ry to keep amoldingmachine suppliedwith sand for continuous operation, because theslowly'and intermittently moving drum does not accelerate the movementof the sand and scrap. 1 Such acceleration renders the separationinefficient. r

The invention exemplifies a sand handling apparatus which'isparticularly adapted for large quantities of molding sand, and in whichthe separating drum is intermittently operated to attain-the advantagesaforesaid.

Theinvention isnot to be understood as restricted to the details setforth, since these may be modified within the scope or" the :appended'claims, withoutdeparting from the spirit andscope ofthe invention.

Having thus described the invention, what I claim as new and desire tosecure by Letters Patent, is: v I

1. In a machine for handling molding sand, the combination of aconveyorcomprising an endless chain andbuckets, a magnetic separatorcomprising a rotatable drum to which the sand is delivered by thebuckets, and a to said pin,- and a is lreyed to the hubstationary magnetin the drum, and mechanism for intermittently operating the drum todischarge separately scrap or metal mixed with the sand, comprising asprocket-wheel engaging and driven by the chain.

2. In a machine for handling molding sand, the combination of a conveyorcomprising an endless chain and buckets, a magnetic separator comprisinga rotatable drum to which the'sand is deliveredby'the buckets and astationary magnet in'th'e drum, and mechanism for intermittentlyoperating the drum to discharge separately scrap or metal mixed withthesand, comprising a sprocket wheel engaging and driven by the chain, andan eccentric pin operated by the sprocket.

3. In amachine for handling molding sand, t 1e combination of aconvcyorcomprising an endless chain and buckets, a magnetic separator comprisinga rotatable drum to which the sand is delivered by the buckets and astationary magnet in the drum, and mechar in for intermittentlyoperating the drum i e separately so "ap or metal mixed with me sand,comprising a sprocket wheel en aging and driven by the chain, an eccenioperated by the sprocket, a pawl opi l and a ratchet-wheel on the a bythe pawl. In a machine for handling molding sand, e combination of acolumn, a conveyor comsing an endless elevator chain and buckets, magnetseparator comprising a rotatable drum t which the sand is deliveredbythe buckets and a stationary magnet in the drum, a'shaft on which Jthemagnet. is mounted, mechanism for ii cermittently operating the drum toischarge separately. scrap or metal mixed v rthe sand, comprising asprocketwhc l c ging and driven by the chain, and cured to the column,in which said bra mechanism and said shaft are mounted.

in a machine for handling molding sand, the combination of a supportingstructure, a magnetic separator mounted on said structm and comprising.a rotatable drum and a stationary magnet in the drum, a conveyor fordelivering the sand to the top part of the drum including a continuouslydriven element, and mechanism driven by said element for intermittentlyrotating said drum.

6. In a machine for handling molding sand, the combination of asupporting structure, a magnetic separator mounted on said structure andcomprising a rotatable drum and a stationary magnet in the drum, meansfor delivering the sand in successive loads to the top part of the drumincluding a series of buckets and an endless chain, and mechanismconnected to be driven by the chain for inter-

